The checks shall be periodically repeated and documented.
8.2 Checking for Damage
The FH 55 and all accessories must be checked once a month for damages. If any of the
components, in particular the instrument housing, a probe or an optional line power supply (AC
adapter) are damaged, the equipment must only be used if it has been cleared for operation by
an authorized person. The damaged parts shall be replaced or sent to the manufacturer (Magnet-
Physik) for repair as soon as possible.
8.3 Calibration
Only regular calibration ensures accurate and reliable measuring results.
The FH 55 and the probe(s) should be calibrated using suitable references normally once a year.
We recommend having this calibration carried out by the manufacturer (Magnet-Physik) or an
authorized calibration laboratory.
8.4 Troubleshooting
In case of trouble with the FH 55, refer to the following instructions.
1. If the instrument cannot be switched on, please check that the power line is OK and that the
power supply cable is properly connected to mains and to the instrument. Check the power
line fuse. It can be found in a little drawer below the power switch.
Danger!
For continued fire protection use only the specified line fuse. Replace the
defective fuse only by a new fuse of same type and rating.
2. Probe missing: Probe missing is always displayed if no probe is connected to the FH 55. If
it is displayed although a probe is connected to the instrument, probably the probe became
defective. If available, you can also check the instrument with another probe. If furthermore
Probe missing is displayed, you can send the probe to MAGNET-PHYSIK for inspection.
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